A PowerPoint Template is a file that can contain commonly used settings to make producing future PowerPoint Presentations and Shows easier. POTX PowerPoint Templates are different than the POT version in that they use the Microsoft Office Open XML format.
A POT file is a template created by PowerPoint, a program used to create slide show presentations. It contains the default layout, formatting, and styles for a slide show. POT files are used to create multiple .PPT files with the same formatting.